﻿/*
ASP.NET MVC Web Application Captcha Library Copyright (C) 2009-2012 Leonid Gordo

This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; 
either version 3.0 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with this library; 
if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 
*/


using System.ComponentModel.DataAnnotations;
using System.Web;

namespace CaptchaLib
{
    public class ValidateCaptchaAttribute : ValidationAttribute
    {
        public string CaptchaUniqueId { get; set; }

        public override bool IsValid(object value)
        {
            var userValue = value as string;
            var correctValue = HttpContext.Current.Session[CaptchaConstants.CaptchaUniqueIdPrefix + CaptchaUniqueId] as string;
            HttpContext.Current.Session.Remove(CaptchaConstants.CaptchaUniqueIdPrefix + CaptchaUniqueId);
            return userValue == correctValue;
        }
    }
}
